package com.lmk;

import java.util.ArrayList;

public class Customer {

    ArrayList<String> users=new ArrayList<>();
    //通过过add方法添加元素
    ArrayList<String> passwords=new ArrayList<>();
    String user;
    String password;
    public void build(){
        for (int i = 0; i <users.size() ; i++) {
            System.out.println(i+1+"\t"+users.get(i)+"\t"+passwords.get(i));
        }
    }
    public void del(){
        for (int i = 0; i <users.size() ; i++) {
            System.out.println(i+"\t"+users.get(i)+"\t"+passwords.get(i));
        }
    }
}
